Profiles

Andreas Gerhardsson

Andreas Gerhardsson

Doktorand

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Arbetar vid Psykologiska institutionen
Telefon 08-16 38 34
E-post andreas.gerhardsson@psychology.su.se
Besöksadress Frescati hagväg 14
Rum 149
Postadress Psykologiska institutionen 106 91 Stockholm

Om mig

Jag tog min master i psykologi 2014 tillsammans med en lärarexamen. En artikel baserat på min masteruppsats publicerades året efter. Sedan min examen har jag arbetat som forskningsassistent på Stressforskningsinstitutet (SU) i ett projekt där vi undersökte hur sömnbrist påverkar responsen på akut social stress. Vi undersökte även hur andra kognitiva och emotionella funktioner påverkades av sömnbrist. 

Undervisning

Jag har sedan vårterminen 2017 börjat undervisa i statistik, hållt en föreläsning om sömn, lett laboration i kognitiv psykologi och handlett mindre studier.

Forskning

Jag är i allmänhet intresserad av experimentell psykologi och i huvudsak interaktionen mellan emotioner och kognition och hur den påverkas av sömnbrist. Det kommer vara huvudfokus i min avhandling.

Publikationer

I urval från Stockholms universitets publikationsdatabas
  • 2016. Andreas Gerhardsson (et al.). Abstracts of the 23rd Congress of the European Sleep Research Society, 13–16 September 2016, Bologna, Italy. Journal of Sleep Research, 25(S1), 17-18., 17-18

    Objectives: Emotional stimuli differently affect working memory (WM) performance. As sleep deprivation has a known impact on both emotion and WM our aim was to investigate how one night without sleep affects emotional WM performance. Methods: Healthy subjects (n = 56; age 18–30 years) were randomized to a total sleep deprivation (TSD) or a rested control (RC) condition. Subjects rated their affective state and performed a 1 and a 3-back WM task consisting of neutral, positive and negative pictures at 3 pm or 6 pm (balanced) the day after sleep manipulation. Accuracy (d’) and target response time (RT) were used as outcomes. Results: In the TSD condition, subjects rated themselves as less positive (P = 0.006) but not more negative than in the RC condition. In the WM task, TSD had a detrimental effect on accuracy (P = 0.03) regardless of difficulty. Moreover, accuracy was higher in the 1-back than in the 3-back (P < 0.001) and higher for neutral compared to both negative and positive stimuli (Ps < 0.05). RT was faster for positive compared to negative and neutral stimuli (Ps < 0.05). The latter effect was particularly pronounced in the TSD condition as shown by a condition*valence interaction (P < 0.03). Conclusions: One night of total sleep loss impaired emotional WM accuracy. Noticeable, RT was faster for positive stimuli compared to negative and neutral stimuli. This effect was particularly pronounced after sleep loss. This suggests that sleep loss strengthens the opposing effects of positive and negative stimuli on WM performance, possibly due to increased emotion reactivity.

  • 2016. Johanna Schwarz (et al.). Abstracts of the 23rd Congress of the European Sleep Research Society, 13–16 September 2016, Bologna, Italy. Journal of Sleep Research, 48-48

    Both sleep loss and social stress are risk factors for health and performance ability. It is assumed that sleep and stress are bidirectional linked, but most of the previous research has focused on studying sleep problems as consequence of stress. We believe that it is important to improve our understanding of the reverse connection, which is less studied. This presentation will cover recent experimental human studies that have investigated how sleep loss affects stress responses and whether it makes individuals more vulnerable to psychosocial stress. A study by Minkel et al. (Health Psychology, 2014) reported that the cortisol response to an acute stress situation was increased after sleep deprivation compared with a control condition indicating a more pronounced activation of the hypothalamic-pituitary-adrenal stress axis. I will also present recently collected data from young (18–30 years) and older (60–72 years) subjects that participated in four conditions (between subject design):

    (i) normal night sleep.

    (ii) normal night sleep & acute stress (Trier Social Stress Test).

    (iii) total sleep deprivation.

    (iv) total sleep deprivation & acute stress.

    The presentation thus provides state of the art knowledge of the link between sleep loss and vulnerability to stress.

  • 2015. Andreas Gerhardsson, Lennart Högman, Håkan Fischer. Frontiers in Psychology 6

    In our daily perception of facial expressions, we depend on an ability to generalize across the varied distances at which they may appear. This is important to how we interpret the quality and the intensity of the expression. Previous research has not investigated whether this so called perceptual constancy also applies to the experienced intensity of facial expressions. Using a psychophysical measure (Borg CR100 scale) the present study aimed to further investigate perceptual constancy of happy and angry facial expressions at varied sizes, which is a proxy for varying viewing distances. Seventy-one (42 females) participants rated the intensity and valence of facial expressions varying in distance and intensity. The results demonstrated that the perceived intensity (PI) of the emotional facial expression was dependent on the distance of the face and the person perceiving it. An interaction effect was noted, indicating that close-up faces are perceived as more intense than faces at a distance and that this effect is stronger the more intense the facial expression truly is. The present study raises considerations regarding constancy of the PI of happy and angry facial expressions at varied distances.

Visa alla publikationer av Andreas Gerhardsson vid Stockholms universitet

Senast uppdaterad: 24 augusti 2017

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